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Peter Norvig 60s. It was only a few years into programming that people discovered these things. It seems like that s the type of thing that everyone should know. Some things that were discovered last year, not everybody should know. Seibel: So should programmers go back and read all the old papers Norvig: No, because there are lots of false starts and lots of mergers where two different fields develop completely different technology and terminology, and then they discover they were really doing the same thing. I think you d rather have a story from the modern point of view rather than have to follow all the steps. But you should have them. I don t know what the best books are for that since I picked it up the hard way, piecemeal. Seibel: So back to designing software. What about when you re working on bigger programs, where you re not going to be able to just remember how all the code fits together Then how do you design it Norvig: I think you want to have good documentation at the level of overall system design. What s the thing supposed to do and how s it going to do it Documentation for every method is usually more tedious than it needs to be. Most of the time it just duplicates what you could read from the name of the function and the parameters. But the overall design of what s going to do what, that s really important to lay out first. It s got to be something that everybody understands and it s also got to be the right choice. One of the most important things for having a successful project is having people that have enough experience that they build the right thing. And barring that, if it s something that you haven t built before, that you don t know how to do, then the next best thing you can do is to be flexible enough that if you build the wrong thing you can adjust. Seibel: How much do you think you can you sit down and figure out how something ought to work, assuming it s not something that you ve built before Do you need to start writing code in order to really understand what the problem is Norvig: One way to think about it is going backwards. You want to get to an end state where you have something that s good and for some problems there s roughly one thing that s good. For other problems there are roughly millions and you can go in lots of different directions and they d all be
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Peter Norvig roughly the same. So I think it s different depending on which type of those types of problems you have. Then you want to think about what are the difficult choices vs. what are the easy ones. What s going to come back to really screw you if you make the wrong architectural choice if you hit built-in limitations or if you re just building the wrong thing. At Google I think we run up against all these types of problems. There s constantly a scaling problem. If you look at where we are today and say, we ll build something that can handle ten times more than that, in a couple years you ll have exceeded that and you have to throw it out and start all over again. But you want to at least make the right choice for the operating conditions that you ve chosen you ll work for a billion up to ten billion web pages or something. So what does that mean in terms of how you distribute it over multiple machines What kind of traffic are you going to have going back and forth You have to have a convincing story at that level. Some of that you can do with calculations on the back of the envelope, some of that you can do with simulations, and some of that you have to predict the future. Seibel: It seems for that kind of question you ll be far more likely to answer correctly with either back-of-the-envelope calculations or simulation than writing code. Norvig: Yeah, I think that s right. Those are the kind of things where the calculations are probably a better approach. And then there are these issues of some vendor says they re going to have a switch coming out next year that will handle ten times as much traffic; do you design to that Do you believe them Or do you design to what you have today There are a lot of trade-offs there. Then there are user-interface things where you just don t know until you build it. You think this interaction will be great but then you show it to the user and half the users just can t get it. Then you have to backtrack and come up with something new. Seibel: Leaving aside designing user interactions, when is prototyping valuable As opposed to just thinking about how something is going to work
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